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<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hi <span style="color:#1F497D">Reinecke</span><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">Description of problem:<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:18.0pt;text-align:left;text-indent:-18.0pt;mso-list:l0 level1 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">As network issue, System is disconnected from the Storage.<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:18.0pt;text-align:left;text-indent:-18.0pt;mso-list:l0 level1 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">When network recover, we found two path are in “ghost” state<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:18.0pt;text-align:left;text-indent:-18.0pt;mso-list:l0 level1 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">We need to register PRKEY. But it failed when register PRKEY through the two “ghost” path.<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:18.0pt;text-align:left;text-indent:-18.0pt;mso-list:l0 level1 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">It seems wired, maybe the Storage hardware have issue. but now we want to work around this issue in multipath first.<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:18.0pt;text-align:left;text-indent:-18.0pt;mso-list:l0 level1 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Our work around solution is as following<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:42.0pt;text-align:left;text-indent:-21.0pt;mso-list:l0 level2 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Revert this patch “Return 'ghost' state when port is in standby”(5da642ff71254ecda685e82c681e78cab4c75b87)<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:42.0pt;text-align:left;text-indent:-21.0pt;mso-list:l0 level2 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Then all PATH_GHOST will be treated as PATH_FAILED<o:p></o:p></span></p>
<p class="MsoListParagraph" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:42.0pt;text-align:left;text-indent:-21.0pt;mso-list:l0 level2 lfo2;background:white">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">and multipath will only register PRKEY by PATH_UP pathes.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">Questions:<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">so we want to consult whether there some potential issue after we revert the pat<span style="color:#1F497D">c</span>h?<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">We know it will lead to some performance and reliability loss. We mainly worry about
<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">whether there are some potential functional and fundamental issues?<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">Thanks a lot.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">Environment Info:<o:p></o:p></span></p>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif">mpathal (2e0176ad6309077166c9ce90033bfa248_1) dm-2 </span><span lang="EN-US">TestSAN</span><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif">size=20G features='1 queue_if_no_path' hwhandler='0' wp=rw<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif">`-+- policy='round-robin 0' prio=50 status=active<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> |- 8:0:5:1 sddg 8:96 active ready running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> `- 9:0:6:1 sdwh 12:112 active ready running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif">`-+- policy='round-robin 0' prio=10 status=enabled<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> |- 10:0:5:1 sdga 21:96 active ready running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> `- 11:0:6:1 sdhb 81:112 active ready running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif">`-+- policy='round-robin 0' prio=1 status= enabled<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> |- 12:0:5:1 sdgj 15:6 active ghost running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"> `- 13:0:6:1 sdhk 16:112 active ghost running<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;background:white"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></pre>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">defaults {<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> path_checker tur<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> no_path_retry 18<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> path_grouping_policy group_by_prio<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> prio const<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> deferred_remove yes<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> uid_attribute "ID_SERIAL"<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> reassign_maps no<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> failback immediate<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> log_checker_err once<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">devices {<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> device {<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> vendor "TestSAN"<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> product "LU"<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> path_grouping_policy group_by_prio<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> no_path_retry 30<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> prio alua<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> path_checker tur<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> path_selector "round-robin 0"<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> hardware_handler "0"<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> failback 15<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="mso-margin-top-alt:12.0pt;margin-right:12.0pt;margin-bottom:12.0pt;margin-left:0cm;text-align:left;background:white">
<span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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